<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>01_JS的三种引入方式</title>
    <script src="01.js">

    </script>
</head>
<body>
    <button onclick="alert('请先登录')">点击即玩</button>
    <button onclick="console.log('manba out')">点我</button>

    <h1 id="aaa">我是一级标题</h1>
    <script>
       console.log("我是内部JS,我被执行力");
        console.log(aaa);
    </script>
</body>
</html>